Alarm unit



FIG. 1 is a perspective view of an alarm unit showing our design;

FIG. 2 is a left side view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is right side view thereof;

FIG. 5 is top view thereof;

FIG. 6 is a rear view thereof; and,

FIG. 7 is a bottom view thereof.

The broken lines depict unclaimed environmental subject matter.

The dot-dash lines illustrate the boundary of the claimed design. 

CLAIM We claim the ornamental design for an alarm unit, as shown and described. 